5. Remove the chuck
• Remove the chuck
6. Clean the chuck:
• Clean the chuck with a brush
7. Insert the chuck:
• Insert the cleaned chuck
8. Tighten the chuck:
• Lock the shaft with a bit
• Fasten the chuck with the chuck key 100.0017
as shown
9. Fix the dust hood:
• Pull on the dust hood
10. Close handpiece
• Insert the bit
• Close the handpiece in direction of arrow
11. Fix the screw:
• Rescrew the slotted screw with a screwdriver